EP2381771B1 - Auxin herbicide composition - Google Patents
Auxin herbicide composition Download PDFInfo
- Publication number
- EP2381771B1 EP2381771B1 EP09833936.9A EP09833936A EP2381771B1 EP 2381771 B1 EP2381771 B1 EP 2381771B1 EP 09833936 A EP09833936 A EP 09833936A EP 2381771 B1 EP2381771 B1 EP 2381771B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- monomethylamine
- dimethylamine
- dicamba
- composition
- salt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000203 mixture Substances 0.000 title claims description 100
- 239000004009 herbicide Substances 0.000 title claims description 50
- 230000002363 herbicidal effect Effects 0.000 title claims description 49
- 229930192334 Auxin Natural products 0.000 title claims description 40
- 239000002363 auxin Substances 0.000 title claims description 40
- SEOVTRFCIGRIMH-UHFFFAOYSA-N indole-3-acetic acid Chemical compound C1=CC=C2C(CC(=O)O)=CNC2=C1 SEOVTRFCIGRIMH-UHFFFAOYSA-N 0.000 title claims description 34
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical class NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 claims description 144
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 claims description 116
- 239000005631 2,4-Dichlorophenoxyacetic acid Substances 0.000 claims description 48
- IWEDIXLBFLAXBO-UHFFFAOYSA-N dicamba Chemical compound COC1=C(Cl)C=CC(Cl)=C1C(O)=O IWEDIXLBFLAXBO-UHFFFAOYSA-N 0.000 claims description 37
- 239000005504 Dicamba Substances 0.000 claims description 35
- 239000002253 acid Substances 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 125000002147 dimethylamino group Chemical class [H]C([H])([H])N(*)C([H])([H])[H] 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 9
- 150000001412 amines Chemical class 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 239000012895 dilution Substances 0.000 claims description 4
- 238000010790 dilution Methods 0.000 claims description 4
- 239000008247 solid mixture Substances 0.000 claims description 4
- 238000009472 formulation Methods 0.000 description 26
- 238000002425 crystallisation Methods 0.000 description 14
- 150000003839 salts Chemical class 0.000 description 14
- -1 pyridyloxy acetic acid Chemical compound 0.000 description 12
- 239000003795 chemical substances by application Substances 0.000 description 8
- 235000008504 concentrate Nutrition 0.000 description 8
- 239000012141 concentrate Substances 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 8
- 239000004094 surface-active agent Substances 0.000 description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- 125000001309 chloro group Chemical group Cl* 0.000 description 6
- 238000011068 loading method Methods 0.000 description 6
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 6
- 241000196324 Embryophyta Species 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000005018 casein Substances 0.000 description 4
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 4
- 235000021240 caseins Nutrition 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- IUQJDHJVPLLKFL-UHFFFAOYSA-N 2-(2,4-dichlorophenoxy)acetate;dimethylazanium Chemical compound CNC.OC(=O)COC1=CC=C(Cl)C=C1Cl IUQJDHJVPLLKFL-UHFFFAOYSA-N 0.000 description 3
- 239000003125 aqueous solvent Substances 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 230000008635 plant growth Effects 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Natural products CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- 241001435147 Arctotheca Species 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 2
- WHKUVVPPKQRRBV-UHFFFAOYSA-N Trasan Chemical compound CC1=CC(Cl)=CC=C1OCC(O)=O WHKUVVPPKQRRBV-UHFFFAOYSA-N 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical compound C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- LCPDWSOZIOUXRV-UHFFFAOYSA-N phenoxyacetic acid Chemical compound OC(=O)COC1=CC=CC=C1 LCPDWSOZIOUXRV-UHFFFAOYSA-N 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 1
- BCMCBBGGLRIHSE-UHFFFAOYSA-N 1,3-benzoxazole Chemical compound C1=CC=C2OC=NC2=C1 BCMCBBGGLRIHSE-UHFFFAOYSA-N 0.000 description 1
- CJTNLEQLKKYLFO-UHFFFAOYSA-N 1-butoxyethanol Chemical class CCCCOC(C)O CJTNLEQLKKYLFO-UHFFFAOYSA-N 0.000 description 1
- OVSKIKFHRZPJSS-UHFFFAOYSA-N 2,4-D Chemical compound OC(=O)COC1=CC=C(Cl)C=C1Cl OVSKIKFHRZPJSS-UHFFFAOYSA-N 0.000 description 1
- HXKWSTRRCHTUEC-UHFFFAOYSA-N 2,4-Dichlorophenoxyaceticacid Chemical compound OC(=O)C(Cl)OC1=CC=C(Cl)C=C1 HXKWSTRRCHTUEC-UHFFFAOYSA-N 0.000 description 1
- AJBZENLMTKDAEK-UHFFFAOYSA-N 3a,5a,5b,8,8,11a-hexamethyl-1-prop-1-en-2-yl-1,2,3,4,5,6,7,7a,9,10,11,11b,12,13,13a,13b-hexadecahydrocyclopenta[a]chrysene-4,9-diol Chemical compound CC12CCC(O)C(C)(C)C1CCC(C1(C)CC3O)(C)C2CCC1C1C3(C)CCC1C(=C)C AJBZENLMTKDAEK-UHFFFAOYSA-N 0.000 description 1
- FWEOQOXTVHGIFQ-UHFFFAOYSA-N 8-anilinonaphthalene-1-sulfonic acid Chemical compound C=12C(S(=O)(=O)O)=CC=CC2=CC=CC=1NC1=CC=CC=C1 FWEOQOXTVHGIFQ-UHFFFAOYSA-N 0.000 description 1
- 235000003880 Calendula Nutrition 0.000 description 1
- 240000001432 Calendula officinalis Species 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000005574 MCPA Substances 0.000 description 1
- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 description 1
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 description 1
- RWRDLPDLKQPQOW-UHFFFAOYSA-N Pyrrolidine Chemical compound C1CCNC1 RWRDLPDLKQPQOW-UHFFFAOYSA-N 0.000 description 1
- 240000000111 Saccharum officinarum Species 0.000 description 1
- 235000007201 Saccharum officinarum Nutrition 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 239000013011 aqueous formulation Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- HUBANNPOLNYSAD-UHFFFAOYSA-N clopyralid Chemical compound OC(=O)C1=NC(Cl)=CC=C1Cl HUBANNPOLNYSAD-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical class OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- 235000014666 liquid concentrate Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- SIOXPEMLGUPBBT-UHFFFAOYSA-N picolinic acid Chemical class OC(=O)C1=CC=CC=N1 SIOXPEMLGUPBBT-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 125000005554 pyridyloxy group Chemical group 0.000 description 1
- 238000012430 stability testing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
- A01N37/36—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids
- A01N37/38—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids having at least one oxygen or sulfur atom attached to an aromatic ring system
- A01N37/40—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids having at least one oxygen or sulfur atom attached to an aromatic ring system having at least one carboxylic group or a thio analogue, or a derivative thereof, and one oxygen or sulfur atom attached to the same aromatic ring system
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
- A01N37/36—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids
- A01N37/38—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids having at least one oxygen or sulfur atom attached to an aromatic ring system
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N39/00—Biocides, pest repellants or attractants, or plant growth regulators containing aryloxy- or arylthio-aliphatic or cycloaliphatic compounds, containing the group or, e.g. phenoxyethylamine, phenylthio-acetonitrile, phenoxyacetone
- A01N39/02—Aryloxy-carboxylic acids; Derivatives thereof
- A01N39/04—Aryloxy-acetic acids; Derivatives thereof
Definitions
- This invention relates to an auxin herbicide composition comprising at least one of 2,4-D and dicamba and in particular a composition of auxin herbicides in the form of salts which allows a high loading of active auxin herbicide comprising at least one of 2,4-D and dicamba to be provided in aqueous composition.
- the invention also relates to an aqueous composition of auxin herbicide salts having a high loading of at least one of 2,4-D and dicamba and the preparation of the salt composition and high loading aqueous composition and methods of controlling plant growth using the compositions.
- Auxin herbicides have been widely used as herbicides and include phenoxyacids such as phenoxy-acetic, -propionic and -butyric acid herbicides and their esters; phenyl acid herbicides such as 3,6-dichloro-o-anisic acid; pyridyloxy acids such as 3,5,6,pyridyloxy acetic acid; and pyridine carboxylic acids such as 3,6-dichloropyridine-2-carboxylic acid.
- phenoxyacids such as phenoxy-acetic, -propionic and -butyric acid herbicides and their esters
- phenyl acid herbicides such as 3,6-dichloro-o-anisic acid
- pyridyloxy acids such as 3,5,6,pyridyloxy acetic acid
- pyridine carboxylic acids such as 3,6-dichloropyridine-2-carboxylic acid.
- Phenoxy acetic acid herbicides including 2,4-Dichlorophenoxy acetic acid (2,4-D) and 4-chloro-2-methylphenoxy acetic acid (MCPA) and their esters such as the 2-ethylhexyl and butoxy ethanol esters are used to control broadleaf weeds in crops such as cereals, sugar cane turf pastures and the like.
- Auxin herbicides are generally of formula wherein
- the amine salts of the auxin herbicides are in many cases water soluble and aqueous formulations of the amine salts are convenient to use. High concentrations of the amine salts can be prepared thereby potentially minimising the need to transport water in the formulated product while at the same time avoiding or minimising the need to use solvents with the potential disadvantages of flammability, and residue.
- the concentrate formulations can conveniently be diluted in a spray tank for soil or foliar application.
- auxin amine salts One of the significant limitations on the formulation and use of the auxin amine salts is the poor solution stability at low temperature particularly in highly concentrated solutions, for example of at least 500g/l (based on active acid equivalent). This places limitations on the storage and handling of the auxin amine salts with the result that the loading of salt needs to be lower than would normally be stable due to the propensity to form a significant proportion of crystalline deposits at low temperature which are not always readily redissolved.
- the solution stability of the auxins may be significantly improved allowing significantly higher loadings to be formulated by using a combination of the monomethylamine (MMA) and dimethylamine (DMA) salts of at least one of 2,4-D and dicamba in particular molar ratio of monomethylamine to dimethylamine.
- MMA monomethylamine
- DMA dimethylamine
- an aqueous liquid herbicide composition comprising solution of at least one of 2,4-D and dicamba in the form of the monomethylamine salt and at least one of 2,4-D and dicamba in the form of the dimethylamine salt wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1:20 to 4:6, preferably from 1:20 to 3:7, and even more preferably from 1:20 to 1:4.
- the molar ratio of monomethylamine : dimethylamine comprises no lower proportion of monomethylamine salt than 1:15, more preferably 1:12 and more preferably 1:8.
- an aqueous liquid herbicide composition comprising solution of 2,4-D in the form of the monomethylamine salt and 2,4-D in the form of the dimethylamine salt wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1:20 to 4:6, preferably from 1:20 to 3:7, and even more preferably from 1:20 to 1:4.
- the molar ratio of monomethylamine : dimethylamine comprises no lower proportion of monomethylamine salt than 1:15, more preferably 1:12 and more preferably 1:8.
- an aqueous liquid herbicide composition comprising a solution of dicamba in the form of the monomethylamine salt and dicamba in the form of the dimethylamine salt wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1:20 to 4:6, preferably from 1:20 to 3:7, and even more preferably from 1:20 to 1:4.
- the molar ratio of monomethylamine : dimethylamine comprises no lower proportion of monomethylamine than 1:15, more preferably 1:12 and more preferably 1:8.
- the concentration of auxin selected from at least one of 2,4-D and dicamba (more preferably the 2,4-D) in the aqueous composition is at least 500 g/l (preferably at least 600 g/l, more preferably at least 625g/l, still more preferably 650g/l and still more preferably at least 700g/l) based on herbicidal acid equivalent.
- a solid composition for forming the aqueous liquid herbicide composition on dilution with water comprising auxin herbicide comprising at least one of 2,4-D and dicamba in the form of the monomethylamine salt and at least one of 2,4-D and dicamba in the form of the dimethylamine salt wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1:20 to 4:6, preferably from 1:20 to 3:7, and even more preferably from 1:20 to 1:4.
- the molar ratio of monomethylamine : dimethylamine comprises no lower proportion of monomethylamine salt than 1:15, more preferably 1:12 and more preferably 1:8.
- a process for preparing a composition described above comprising providing at least one herbicidal auxin comprising at least one of 2,4-D and dicamba and reacting the acid form of the auxin herbicide with methylamine and dimethylamine in a molar ratio of 1:20 to 4:6, preferably from 1:20 to 3:7, and even more preferably from 1:20 to 1:4.
- the molar ratio of monomethylamine : dimethylamine comprises no lower proportion of monomethylamine salt than 1:15, more preferably 1:12 and more preferably 1:8.
- aqueous liquid herbicide composition comprising dissolving an auxin monomethylamine salt and herbicidal dimethylamine salt of an auxin herbicide in an aqueous liquid to provide a composition as hereinbefore described.
- auxin herbicide salts are generally of formula: wherein
- the most preferred embodiment uses 2,4-D as the auxin component.
- the particularly preferred ratio of monomethylamine (MMA) to dimethylamine (DMA) is about 1:4 to 1:20.
- composition may if desired include other herbicides including other amine salts of auxins it is preferred that the monomethylamine and dimethylamine constitute at least 80% by weight of the amine content of the composition, preferably at least 90% by weight of the amine content and most preferably at least 95% by weight of the amine content.
- the concentration of auxin herbicide is at least 500 g/l (preferably at least 600 g/l, more preferably at least 625g/l, still more preferably 650 g/l and still more preferably at least 700 g/l) based on acid herbicidal acid equivalent.
- the pH of the aqueous herbicide concentrate is preferably in the range of from 6 to 10.
- the composition may be prepared by mixing of the auxin amine salts in the prescribed ratio or alternatively one or both of the salts may be formed by reaction of monomethylamine and dimethylamine with the auxin.
- a process for preparing a auxin salt composition comprising providing at least one herbicidal auxin and reacting the acid with methylamine and dimethylamine in a molar ratio of 1:20 to 4:6, preferably from 1:20 to 3:7, and even more preferably from 1:20 to 1:4.
- the molar ratio of monomethylamine : dimethylamine comprises no lower proportion of monomethylamine than 1:15, more preferably 1:12 and more preferably 1:8.
- a method of controlling plant growth comprising diluting a composition a concentrate composition as hereinbefore described with water and applying the diluted composition to plants or to soil in which growth of plants are to be controlled.
- the composition may, for example, be diluted with water to provide a concentration of auxin herbicide salt in the range of from 0.1 g/l to 150 g/l (based on acid equivalent).
- the salt concentrate composition may, for example, depending on the auxin be applied at a rate of from 0.01 kg/ha to 5 kg/ha based on total acid equivalent in order to achieve control of weeds.
- compositions of this invention may if desired be free of non-aqueous solvents such as ethylene glycol.
- the herbicide composition comprising solution of auxin herbicide in the form of the monomethylamine salt and auxin herbicide in the form of the dimethylamine salt wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1 : 20 to 1 : 5 (preferably from 1 : 25 to 1 : 5 and most preferably from 1 : 12 to 1 : 3) contains no more than 5% by weight non-aqueous solvents and more preferably is essentially free of non-aqueous solvents.
- the composition of the invention may and preferably will include a compatibility agent such as casein or EDTA which we have found to improve compatibility of the auxin amine salts and other herbicides.
- the amount of compatibility agent may be at least a compatibility enhancing amount.
- the composition according to the invention further comprising casein in an amount of from 0.05 to 10 parts by weight casein per 100 parts by weight auxin herbicide acid equivalent.
- the amount of casein is preferably from 0.01 to 5% by weight of a concentrate composition and more preferably is from 0.1 to 5% by weight of the composition.
- surfactants include, nonaromatic-based surfactants, e.g. those based on heterocycles, olefins, aliphatics or cycloaliphatics, for example surface-active mono- or poly-alkyl-substituted and subsequently derivatized, e.g. alkoxylated, sulfated, sulfonated or phosphated, pyridine, pyrimidine, triazine, pyrole, pyrolidine, furan, thiophene, benzoxazole, benzthiazole and triazole compounds, and/or aromatic-based surfactants, e.g.
- compositions according to the invention can, for example, comprise nonaromatic or aromatic surfactants or mixtures of nonaromatic and aromatic surfactants.
- the mixed salt auxin (2,4-D and or dicamba) herbicides with the defined molar ratio of MMA:DMA exhibit an enhanced cold storage stability and reduced crystal growth at cold temperatures.
- the compositions also exhibit an improvement in stability in solution when diluted with water of variable quality that tends to produce precipitation in other auxins in concentrate compositions.
- Example 1 The composition of Example 1 was prepared by mixing the components of Table 1 in the proportions shown to provide a molar ratio of 10 : 90 MMA/DMA.
- Table 1 2,4-D 650g/l (ae) present as the DMA (90%) & MMA (10%).
- Example 2 The composition of Example 2 was prepared by mixing the components shown in Table 2 in the amounts by weight recorded to provide a 2,4-D composition comprising 2,4-D at a concentration of 700 g/l 2,4-D ae and a molar ratio of 80:20 DMA:MMA.
- Table 2 2,4-D 700g/l (ae) present as the DMA (80%) & MMA (20%).
- This example compares the storage stability at 0°C of compositions having a range of molar proportions of monomethylamine and dimethylamine salts prepared in accordance with Example 1 at a concentration of 650g/l ae.
- Example 1 The composition of Example 1 was prepared with the exception that the ratio of monomethylamine (MMA) and dimethylamine (DMA) was varied. Each example was prepared by diluting 2,4-D monomethylamine and 2,4-D dimethylamine at various ratios.
- MMA monomethylamine
- DMA dimethylamine
- Formulation 3.1 and Formulation 3.5 are comparative examples.
- compositions of Examples 3 and 3a comprising DMA and MMA salts of Dicamba were prepared by mixing the components identified in the following Table 4 in the amounts by weight specified.
- Table 4 Example 3 DICAMBA 800g/l (ae) present as the DMA (80%) & MMA (20%). Ingredient Weight (g) Dicamba Technical (98%) 853.8 MMA (40%) 62.4 DMA (60%) 249.8 Compatibility agent 4.0 Water To 1l
- Tables 5a and 5b The results are shown in Tables 5a and 5b respectively.
- the crystallisation is graphically presented in Figures 1 and 2 respectively.
- Table 5a 650 g/l acid equivalent 2,4-D Formulation MMA DMA % Crystallisation at 0 deg. C 5a.1 0 100 100 5a.2 5 95 0 5a.3 10 90 0 5a.4 15 85 0 5a.5 20 80 0 5a.6 25 75 0 5a.7 30 70 0 5a.8 35 65
- the cold temperature crystallization in mixed salt compositions of Dicamba was determined for compositions of 700g/l, 750g/l and 800g/l acid equivalent dicamba and the results are shown in Tables 6a, 6b and 6c.
- the percent crystallisation of DMA/MMA mixture with increasing percent MMA content for 800g/l acid equivalent Dicamba formulations is shown on Figure 3 .
- Formulation 6b.1 is a Comparative Example.
- Table 6c Dicamba 800g/l ae Formulation MMA DMA % Crystallization at 0 deg. C 6c.1 0 100 10 6c.2 10 90 5 6c.3 20 80 1 6c.4 30 70 0 6c.5 100 0 100
- Formulations 6c.1, 6c.5 are Comparative Examples.
- compositions of the invention were conducted in comparison with Amicide 625, a commercially available 2,4-D composition comprising 625g/L acid equivalent of 2,4-D present as the DMA and diethanolamine salts.
- compositions were diluted and applied to distinct plots of Capeweed having 30 plants per m 2 .
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Description
- This invention relates to an auxin herbicide composition comprising at least one of 2,4-D and dicamba and in particular a composition of auxin herbicides in the form of salts which allows a high loading of active auxin herbicide comprising at least one of 2,4-D and dicamba to be provided in aqueous composition. The invention also relates to an aqueous composition of auxin herbicide salts having a high loading of at least one of 2,4-D and dicamba and the preparation of the salt composition and high loading aqueous composition and methods of controlling plant growth using the compositions.
- Auxin herbicides have been widely used as herbicides and include phenoxyacids such as phenoxy-acetic, -propionic and -butyric acid herbicides and their esters; phenyl acid herbicides such as 3,6-dichloro-o-anisic acid; pyridyloxy acids such as 3,5,6,pyridyloxy acetic acid; and pyridine carboxylic acids such as 3,6-dichloropyridine-2-carboxylic acid. Phenoxy acetic acid herbicides including 2,4-Dichlorophenoxy acetic acid (2,4-D) and 4-chloro-2-methylphenoxy acetic acid (MCPA) and their esters such as the 2-ethylhexyl and butoxy ethanol esters are used to control broadleaf weeds in crops such as cereals, sugar cane turf pastures and the like. Auxin herbicides are generally of formula
- R is the alcohol portion of the ester or is a salt counter ion such a substituted ammonium counter ion;
- A is nitrogen or CH;
- X1,X2 and X3 are independently selected from hydrogen, halogen (preferably chloro) and methyl, preferably from hydrogen and chloro and most preferably at least two of X1,X2 and X3 are selected from chloro and methyl ;
- Y is a bond, oxgen or 1,4-oxyphenoxy;
- R1 is selected from hydrogen and methyl and preferably is hydrogen; and
- n is from 0 to 3.
- The amine salts of the auxin herbicides are in many cases water soluble and aqueous formulations of the amine salts are convenient to use. High concentrations of the amine salts can be prepared thereby potentially minimising the need to transport water in the formulated product while at the same time avoiding or minimising the need to use solvents with the potential disadvantages of flammability, and residue.
- At the site of use the concentrate formulations can conveniently be diluted in a spray tank for soil or foliar application.
- One of the significant limitations on the formulation and use of the auxin amine salts is the poor solution stability at low temperature particularly in highly concentrated solutions, for example of at least 500g/l (based on active acid equivalent). This places limitations on the storage and handling of the auxin amine salts with the result that the loading of salt needs to be lower than would normally be stable due to the propensity to form a significant proportion of crystalline deposits at low temperature which are not always readily redissolved.
- The discussion of documents, acts, materials, devices, articles and the like is included in this specification solely for the purpose of providing a context for the present invention. It is not suggested or represented that any or all of these matters formed part of the prior art base or were common general knowledge in the field relevant to the present invention as it existed before the priority date of each claim of this application.
- We have found that the solution stability of the auxins may be significantly improved allowing significantly higher loadings to be formulated by using a combination of the monomethylamine (MMA) and dimethylamine (DMA) salts of at least one of 2,4-D and dicamba in particular molar ratio of monomethylamine to dimethylamine.
- Accordingly, we provide an aqueous liquid herbicide composition comprising solution of at least one of 2,4-D and dicamba in the form of the monomethylamine salt and at least one of 2,4-D and dicamba in the form of the dimethylamine salt wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1:20 to 4:6, preferably from 1:20 to 3:7, and even more preferably from 1:20 to 1:4.
- In one set of embodiments the molar ratio of monomethylamine : dimethylamine comprises no lower proportion of monomethylamine salt than 1:15, more preferably 1:12 and more preferably 1:8.
- In one set of preferred embodiments we provide an aqueous liquid herbicide composition comprising solution of 2,4-D in the form of the monomethylamine salt and 2,4-D in the form of the dimethylamine salt wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1:20 to 4:6, preferably from 1:20 to 3:7, and even more preferably from 1:20 to 1:4. In this set of embodiments it is preferred that the molar ratio of monomethylamine : dimethylamine comprises no lower proportion of monomethylamine salt than 1:15, more preferably 1:12 and more preferably 1:8.
- In another less preferred set of embodiments we provide an aqueous liquid herbicide composition comprising a solution of dicamba in the form of the monomethylamine salt and dicamba in the form of the dimethylamine salt wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1:20 to 4:6, preferably from 1:20 to 3:7, and even more preferably from 1:20 to 1:4. In this set of embodiments it is preferred that the molar ratio of monomethylamine : dimethylamine comprises no lower proportion of monomethylamine than 1:15, more preferably 1:12 and more preferably 1:8.
- In an embodiment the concentration of auxin selected from at least one of 2,4-D and dicamba (more preferably the 2,4-D) in the aqueous composition is at least 500 g/l (preferably at least 600 g/l, more preferably at least 625g/l, still more preferably 650g/l and still more preferably at least 700g/l) based on herbicidal acid equivalent.
- In one embodiment there is provided a solid composition for forming the aqueous liquid herbicide composition on dilution with water the solid composition comprising auxin herbicide comprising at least one of 2,4-D and dicamba in the form of the monomethylamine salt and at least one of 2,4-D and dicamba in the form of the dimethylamine salt wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1:20 to 4:6, preferably from 1:20 to 3:7, and even more preferably from 1:20 to 1:4. In this set of embodiments it is preferred that the molar ratio of monomethylamine : dimethylamine comprises no lower proportion of monomethylamine salt than 1:15, more preferably 1:12 and more preferably 1:8.
- In another embodiment there is provided a process for preparing a composition described above comprising providing at least one herbicidal auxin comprising at least one of 2,4-D and dicamba and reacting the acid form of the auxin herbicide with methylamine and dimethylamine in a molar ratio of 1:20 to 4:6, preferably from 1:20 to 3:7, and even more preferably from 1:20 to 1:4. In this set of embodiments it is preferred that the molar ratio of monomethylamine : dimethylamine comprises no lower proportion of monomethylamine salt than 1:15, more preferably 1:12 and more preferably 1:8.
- In another embodiment there is provided a method of preparing an aqueous liquid herbicide composition comprising dissolving an auxin monomethylamine salt and herbicidal dimethylamine salt of an auxin herbicide in an aqueous liquid to provide a composition as hereinbefore described.
- Throughout the description and the claims of this specification the word "comprise" and variations of the word, such as "comprising" and "comprises" is not intended to exclude other additives, components, integers or steps.
-
- A is nitrogen or CH;
- X1,X2 and X3 are independently selected from hydrogen, halogen (preferably chloro) and methyl, preferably from hydrogen and chloro and most preferably at least two of X1,X2 and X3 are selected from chloro and methyl ;
- Y is a bond, oxygen or 1,4-oxyphenoxy;
- R is the monomethylamine or dimethylamine counter ion;
- R1 is selected from hydrogen and methyl and preferably is hydrogen; and
- n is from 0 to 3;
the auxin herbicide component of the composition - 2,4-D
- (2,4-dichlorophenoxyacetic acid) and
- dicamba
- (3,6-dichloro-o-anisic acid).
- The most preferred embodiment uses 2,4-D as the auxin component.
- The particularly preferred ratio of monomethylamine (MMA) to dimethylamine (DMA) is about 1:4 to 1:20.
- While the composition may if desired include other herbicides including other amine salts of auxins it is preferred that the monomethylamine and dimethylamine constitute at least 80% by weight of the amine content of the composition, preferably at least 90% by weight of the amine content and most preferably at least 95% by weight of the amine content.
- In a particularly preferred embodiment the concentration of auxin herbicide is at least 500 g/l (preferably at least 600 g/l, more preferably at least 625g/l, still more preferably 650 g/l and still more preferably at least 700 g/l) based on acid herbicidal acid equivalent.
- The pH of the aqueous herbicide concentrate is preferably in the range of from 6 to 10.
- The composition may be prepared by mixing of the auxin amine salts in the prescribed ratio or alternatively one or both of the salts may be formed by reaction of monomethylamine and dimethylamine with the auxin. Accordingly, in one embodiment there is provided a process for preparing a auxin salt composition comprising providing at least one herbicidal auxin and reacting the acid with methylamine and dimethylamine in a molar ratio of 1:20 to 4:6, preferably from 1:20 to 3:7, and even more preferably from 1:20 to 1:4. In this set of embodiments it is preferred that the molar ratio of monomethylamine : dimethylamine comprises no lower proportion of monomethylamine than 1:15, more preferably 1:12 and more preferably 1:8.
- In one embodiment there is provided a method of controlling plant growth comprising diluting a composition a concentrate composition as hereinbefore described with water and applying the diluted composition to plants or to soil in which growth of plants are to be controlled. The composition may, for example, be diluted with water to provide a concentration of auxin herbicide salt in the range of from 0.1 g/l to 150 g/l (based on acid equivalent).
- The salt concentrate composition may, for example, depending on the auxin be applied at a rate of from 0.01 kg/ha to 5 kg/ha based on total acid equivalent in order to achieve control of weeds.
- In some cases solvents have been used in concentrate auxin compositions such as ethylene glycol, in an attempt to limit the formation of crystalline deposits during storage of the aqueous liquid concentrate. The compositions of this invention may if desired be free of non-aqueous solvents such as ethylene glycol. Accordingly in one embodiment the herbicide composition comprising solution of auxin herbicide in the form of the monomethylamine salt and auxin herbicide in the form of the dimethylamine salt wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1 : 20 to 1 : 5 (preferably from 1 : 25 to 1 : 5 and most preferably from 1 : 12 to 1 : 3) contains no more than 5% by weight non-aqueous solvents and more preferably is essentially free of non-aqueous solvents.
- In a further embodiment the composition consists essentially of:
- i) auxin herbicide in the form of the monomethylamine salt and auxin herbicide in the form of the dimethylamine salt wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1:20 to 4:6, preferably from 1:20 to 3:7, and even more preferably from 1:20 to 1:4. In this set of embodiments it is preferred that the molar ratio of monomethylamine : dimethylamine comprises no lower proportion of monomethylamine salt than 1:15, more preferably 1:12 and more preferably 1:8;
- ii) water;
- iii) no more than 10% by weight, preferably no more than 5% and more preferably no more than 2% by weight based on the total weight of the composition of additives selected from surfactants and compatibility agents; and iv) wherein the concentration of auxin salt herbicide in the aqueous composition is at least 500 g/l (preferably at least 600 g/l, more preferably at least 625g/l, still more preferably 650 g/l and still more preferably at least 700 g/l) based on acid herbicidal acid equivalent.
- The composition of the invention may and preferably will include a compatibility agent such as casein or EDTA which we have found to improve compatibility of the auxin amine salts and other herbicides. The amount of compatibility agent may be at least a compatibility enhancing amount. In a preferred embodiment the composition according to the invention further comprising casein in an amount of from 0.05 to 10 parts by weight casein per 100 parts by weight auxin herbicide acid equivalent. The amount of casein is preferably from 0.01 to 5% by weight of a concentrate composition and more preferably is from 0.1 to 5% by weight of the composition.
- Examples of surfactants include, nonaromatic-based surfactants, e.g. those based on heterocycles, olefins, aliphatics or cycloaliphatics, for example surface-active mono- or poly-alkyl-substituted and subsequently derivatized, e.g. alkoxylated, sulfated, sulfonated or phosphated, pyridine, pyrimidine, triazine, pyrole, pyrolidine, furan, thiophene, benzoxazole, benzthiazole and triazole compounds, and/or aromatic-based surfactants, e.g. mono- or poly-alkyl-substituted and subsequently derivatized, e.g. alkoxylated, sulfated, sulfonated or phosphated, benzenes or phenols. The surfactants are generally soluble in the solvent phase and are preferably suitable for emulsifying it (together with active ingredients dissolved therein) upon dilution with water to give a spray liquor. The surfactant component when present in compositions according to the invention can, for example, comprise nonaromatic or aromatic surfactants or mixtures of nonaromatic and aromatic surfactants.
- The mixed salt auxin (2,4-D and or dicamba) herbicides with the defined molar ratio of MMA:DMA exhibit an enhanced cold storage stability and reduced crystal growth at cold temperatures. The compositions also exhibit an improvement in stability in solution when diluted with water of variable quality that tends to produce precipitation in other auxins in concentrate compositions.
- The invention will now be described with reference to the following examples. It is to be understood that the examples are provided by way of illustration of the invention and that they are in no way limiting to the scope of the invention.
- In the drawings:
-
Figure 1 is a graph showing the percent crystallisation of a 2,4-D composition of 650g/l acid equivalent (ae) as the percentage of MMA in a MMA/DMA mixture is increased from 0 to 35%. -
Figure 2 is a graph showing the percent crystallisation of a 2,4-D composition of 700g/l ae as the percentage of MMA in a MMA/DMA mixture is increased from 0 to 35%. -
Figure 3 is a graph showing the percent crystallisation of a Dicamba composition of 800g/l ae as the percentage of MMA in a MMA/DMA mixture is increased from 0 to 100%. - Five litres of a mixed amine 650g/l 2,4-D soluble liquid was prepared. The formulation was stored at 54°C for 14 days to evaluate its shelf life.
- The composition of Example 1 was prepared by mixing the components of Table 1 in the proportions shown to provide a molar ratio of 10 : 90 MMA/DMA.
Table 1: 2,4-D 650g/l (ae) present as the DMA (90%) & MMA (10%). Constituent (common name) Concentration [g/l] Purpose in formulation (a) Active constituent/s 2,4-D technical 98% (sufficient to give 650g/l ae 2,4-D) 663.27 Active (b) Chemical name of other constituent/s Dimethylamine (as 60% aqueous solution) 198.53 Solublising amine Monomethylamine (as 40% aqueous solution) 22.06 Solublising amine Compatibility agent 4.00 Compatibility agent Water to 1 litre Solvent - The composition of Example 2 was prepared by mixing the components shown in Table 2 in the amounts by weight recorded to provide a 2,4-D composition comprising 2,4-D at a concentration of 700 g/l 2,4-D ae and a molar ratio of 80:20 DMA:MMA.
Table 2: 2,4-D 700g/l (ae) present as the DMA (80%) & MMA (20%). Ingredient Weight (g) 2,4-D Technical (98%) 714.29 MMA (40%) 47.51 DMA (60%) 190.05 Compatibility agent 4.0 Water To 1l - This example compares the storage stability at 0°C of compositions having a range of molar proportions of monomethylamine and dimethylamine salts prepared in accordance with Example 1 at a concentration of 650g/l ae.
- The composition of Example 1 was prepared with the exception that the ratio of monomethylamine (MMA) and dimethylamine (DMA) was varied. Each example was prepared by diluting 2,4-D monomethylamine and 2,4-D dimethylamine at various ratios.
- Low temperature stability testing was carried out in accordance with the Standard CIPAC Method 39.3 (1999) and the resulting percentage crystallisation is reported in Table 3.
Table 3 2,4-D 650g/l (ae) with various ratios of MMA:DMA % MMA % DMA % Crystallisation at 0 deg. C Formulation 3.1 0 100 100 Formulation 3.2 5 95 0 Formulation 3.3 10 90 0 Formulation 3.4 15 85 3 Formulation 3.5 30 70 14 - Formulation 3.1 and Formulation 3.5 are comparative examples.
- The compositions of Examples 3 and 3a comprising DMA and MMA salts of Dicamba were prepared by mixing the components identified in the following Table 4 in the amounts by weight specified.
Table 4 Example 3 DICAMBA 800g/l (ae) present as the DMA (80%) & MMA (20%).Ingredient Weight (g) Dicamba Technical (98%) 853.8 MMA (40%) 62.4 DMA (60%) 249.8 Compatibility agent 4.0 Water To 1l Example 3a DICAMBA 800g/l (ae) present as the DMA (70%) & MMA (30%) Ingredient Weight (g) Dicamba Technical (98%) 853.8 MMA (40%) 93.7 DMA (60%) 218.6 Compatibility agent 4.0 Water To 1l - The low temperature crystallisation properties of 2,4-D MMA and DMA in mixed salt compositions were examined for compositions with active ingredient loadings of 650 ae g/l and 700 ae g/l.
- The results are shown in Tables 5a and 5b respectively. The crystallisation is graphically presented in
Figures 1 and2 respectively.Table 5a 650 g/l acid equivalent 2,4-D Formulation MMA DMA % Crystallisation at 0 deg. C 5a.1 0 100 100 5a.2 5 95 0 5a.3 10 90 0 5a.4 15 85 0 5a.5 20 80 0 5a.6 25 75 0 5a.7 30 70 0 5a.8 35 65 100 Table 5b 700 g/l acid equivalent 2,4-D Formulation MMA DMA % Crystallisation at 0 deg. C 5b.1 0 100 100 5b.2 5 95 75 5b.3 10 90 55 5b.4 20 80 0 5b.5 25 75 10 5b.6 30 70 100 - The cold temperature crystallization in mixed salt compositions of Dicamba was determined for compositions of 700g/l, 750g/l and 800g/l acid equivalent dicamba and the results are shown in Tables 6a, 6b and 6c. The percent crystallisation of DMA/MMA mixture with increasing percent MMA content for 800g/l acid equivalent Dicamba formulations is shown on
Figure 3 .Table 6a - Comparative Example 6a.1 and 6a.2 Dicamba 700g/l ae Formulation MMA DMA % Crystallization at 0 deg. C 6a.1 0 100 0 6a.2 100 0 80 Table 6b Dicamba 750g/l ae Formulation MMA DMA % Crystallization at 0 deg. C 6b.1 0 100 2 6b.2 10 90 1 6b.3 20 80 0 6b.4 30 70 0 - Formulation 6b.1 is a Comparative Example.
Table 6c Dicamba 800g/l ae Formulation MMA DMA % Crystallization at 0 deg. C 6c.1 0 100 10 6c.2 10 90 5 6c.3 20 80 1 6c.4 30 70 0 6c.5 100 0 100 - Formulations 6c.1, 6c.5 are Comparative Examples.
- Glass house testing of compositions of the invention were conducted in comparison with Amicide 625, a commercially available 2,4-D composition comprising 625g/L acid equivalent of 2,4-D present as the DMA and diethanolamine salts. Formulation 5a.3 - 650g ae/l 2,4-D as DMA/MMA salts in a mole ratio of 90 : 10 Formulation 5b.4 - 700g ae/l 2,4-D as DMA/MMA in a mole ratio of salts of 80 : 20 Comparison - Amicide 625
- The compositions were diluted and applied to distinct plots of Capeweed having 30 plants per m2.
- The ratio of application of 200g/ha ae, 500g/ha ae, 1000g/ha ae and 2000g/ha ae was tested for each formulation. The results are shown in Table 7. The results show that the composition provides activity in the diluted formulation equivalent to other salt formulated of 2,4-D products and yet allows higher load in the concentrate with stability against cold storage and dilution with water of variable quality.
Table 7 Percentage weed control of Capeweed (Arcotheca calendula) 50 days after application of formulations. 250 gae 500 gae 1000 gae 2000 gae Amicide 625 33 66 86 96 Formulation 5a.3 37 70 84 93 Formulation 5b.4 40 56 84 94 Comparison Example c 43 69 87 92
Claims (12)
- An aqueous liquid herbicide composition comprising a solution of at least one of 2,4-D and dicamba in the form of the monomethylamine salt and at least one of 2,4-D and dicamba in the form of the dimethylamine salt wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1:20 to 4:6 and wherein the concentration of at least one of 2,4-D and dicamba is at least 500 g/l based on herbicidal acid equivalent.
- An aqueous liquid herbicide composition according to claim 1 wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1:20 to 3:7.
- An aqueous liquid herbicide composition according to any one of the previous claims wherein the molar ratio of monomethylamine to dimethylamine is 1:20 to 1:4.
- An aqueous liquid herbicide composition according to any one of the previous claims wherein the monomethylamine and dimethylamine constitute at least 80% by weight of the amine content of the composition.
- An aqueous liquid herbicide composition according to any one of the previous claims wherein the monomethylamine and dimethylamine constitute at least 90% by weight of the amine content of the composition.
- An aqueous liquid herbicide composition according to any one of the previous claims wherein the concentration of auxin herbicide selected from at least one of 2,4-D and dicamba is at least 600 g/l based on herbicidal acid equivalent.
- An aqueous liquid herbicide composition according to any one of the previous claims wherein the concentration of auxin herbicide selected from at least one of 2,4-D and dicamba is at least 650 g/l based on herbicidal acid equivalent.
- An aqueous liquid herbicide composition according to any one of the previous claims wherein the 2,4-D is present in an amount of at least 600 g/l based on herbicide acid equivalent.
- An aqueous liquid herbicide composition according to claim 5 wherein dicamba is present in an amount of at least 600 g/l based on herbicide acid equivalent.
- A solid composition for forming a composition according to any one of claims 1 to 9 on dilution with water comprising auxin herbicide comprising at least one of 2,4-D and dicamba in the form of the monomethylamine salt and an auxin herbicide comprising at least one of 2,4-D and dicamba in the form of the dimethylamine salt wherein the molar ratio of monomethylamine to dimethylamine is in the range of 1:20 to 4:6.
- A solid composition according to claim 10 wherein the molar ratio of monomethylamine to dimethylamine is in the range of from 1:20 to 3:7.
- A method for preparing a composition according to any one of claims 1 to 9 comprising providing at least one herbicidal acid selected from 2,4-D and dicamba and reacting the acid with methylamine and dimethylamine in a molar ratio of from 1:20 to 3:7.
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PL1722634T3 (en) | 2004-03-10 | 2011-12-30 | Monsanto Technology Llc | Herbicidal compositions containing n-phosphonomethyl glycine and an auxin herbicide |
CA2472806A1 (en) | 2004-05-18 | 2005-11-18 | Petro-Canada | Compositions and methods for treating turf insect pests and diseases such as fungal infestations |
US9357768B2 (en) | 2006-10-05 | 2016-06-07 | Suncor Energy Inc. | Herbicidal composition with increased herbicidal efficacy |
US8569210B2 (en) | 2008-06-26 | 2013-10-29 | Suncor Energy Inc. | Turfgrass fungicide formulation with pigment |
PL2381771T3 (en) * | 2008-12-23 | 2014-08-29 | Nufarm Australia Ltd | Auxin herbicide composition |
WO2011019652A2 (en) | 2009-08-10 | 2011-02-17 | Monsanto Technology Llc | Low volatility auxin herbicide formulations |
WO2011143690A1 (en) | 2010-05-17 | 2011-11-24 | Nufarm Australia Limited | Process for preparation of herbicidal salts |
NZ603955A (en) | 2010-06-21 | 2013-10-25 | Nufarm Australia Ltd | Herbicidal picolinic acid salt composition |
KR20130109126A (en) | 2010-09-09 | 2013-10-07 | 선코 에너지 인코포레이티드 | Synergistic paraffinic oil and boscalid fungicides |
CA2835391A1 (en) * | 2011-06-01 | 2012-12-06 | Basf Se | Method of preparing an aqueous tank mix comprising a base |
ES2735285T3 (en) | 2011-06-03 | 2019-12-17 | Suncor Energy Inc | Paraffinic oil emulsions in water to control the infection of crop plants by fungal pathogens |
UY39627A (en) | 2011-10-26 | 2022-03-31 | Monsanto Technology Llc | HERBICIDE SALTS OF CARBOXYLIC ACID |
UY34845A (en) | 2012-06-04 | 2014-01-31 | Monsanto Technology Llc | ? WATER CONCENTRATED HERBICIDE COMPOSITIONS CONTAINING GLIFOSATE SALTS AND DICAMBA SALTS |
WO2014071348A1 (en) | 2012-11-05 | 2014-05-08 | Monsanto Technology Llc | Auxin herbicidal mixtures |
DK2961276T3 (en) | 2013-02-27 | 2018-11-19 | Monsanto Technology Llc | Glyphosate and dicamba tank mixtures with improved volatility |
US20160286801A1 (en) * | 2013-03-15 | 2016-10-06 | Suncor Energy Inc. | Herbicidal Compositions |
AU2018201794A1 (en) * | 2018-03-13 | 2019-10-03 | Adama Australia Pty Ltd | Herbicide Formulation |
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- 2009-12-23 CA CA2748084A patent/CA2748084C/en active Active
- 2009-12-23 AR ARP090105117A patent/AR075677A1/en active IP Right Grant
- 2009-12-23 NZ NZ593895A patent/NZ593895A/en unknown
- 2009-12-23 ES ES09833936.9T patent/ES2458348T3/en active Active
- 2009-12-23 WO PCT/AU2009/001690 patent/WO2010071936A1/en active Application Filing
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Also Published As
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AU2009329825B2 (en) | 2013-10-31 |
PL2381771T3 (en) | 2014-08-29 |
AR075677A1 (en) | 2011-04-20 |
US8871683B2 (en) | 2014-10-28 |
US20120058897A1 (en) | 2012-03-08 |
NZ593895A (en) | 2013-09-27 |
AU2009329825A1 (en) | 2011-07-28 |
US9179673B2 (en) | 2015-11-10 |
CA2748084A1 (en) | 2010-07-01 |
BRPI0922509A2 (en) | 2015-08-11 |
EP2381771A4 (en) | 2012-08-01 |
US20150018212A1 (en) | 2015-01-15 |
CA2748084C (en) | 2016-11-29 |
US20100331188A1 (en) | 2010-12-30 |
ES2458348T3 (en) | 2014-05-05 |
EP2381771A1 (en) | 2011-11-02 |
WO2010071936A1 (en) | 2010-07-01 |
US8877685B2 (en) | 2014-11-04 |
BRPI0922509B1 (en) | 2018-03-06 |
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